Process of forming a basic-ferric-sulfate liquor.



FRU'CESS F IDZRMING- A BASICFEELRIC-STJLFATE LIQUOR.

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Lfililll tlllu N0 waiving. Anpllmticu filed April To all whom may concern:

Be it .lcuown that l, SAMUEL El. SADTLER, I

a citizen of the United. States, residing in Montgomery county, State of Pennsylvania, have invent-ed a certain new and useful Proccss of Forming a, Bzlsic-Fei'ric-Sulfute Liquor of which the following is u specification.

l /iv invention relates to the process of making a basic ferric sulfate liquor which may lie uset uuuirdaut for textile fabrics, such as silk, and animal tissues such as skins or lcutlielx In the manufacture of ferric ox'icl from coppems, or desiccated cupperus or fei'ious sulfate, the cof lmrned, in mufiic furnace or retort to produce crude ferric oxld. This oxiol is than wasliedwith Water and the oxidized. iron liquor sulutiou which is drained ofi' constitutes a by-pi'ccluct the manufacture of ferric oxidf' This liquor consists chiefly oif fe 'ric sulfate and the starting O'llfil? my process.

The object of my invention is to produce from such byproduct 2m sfllcieut ful inorduut for fibers and tissues of the charactei" alcove indicated and thereby uti' lizc the some in the manifnctiu'c of c. valuable and useful commercial product.

In carrying out my invention it is utcessa ry not only to neutralize any free sulfuric acid 'i'emainiug from the decomposition of the copperus but to cause a sulwsta-utilll quantity of "ferric hydroxid to g0 iutuhiolutiou into the ferric sulfate of the liquoliutlicieliy obtuiuiup 51, basic ferric sulfate which shall be perfectly soluble but which holcjs ferric hydroxid loosely combined so that shall be readily taken up by the fiber or tissue in the mordanting process. This production of a soluble basic ferric sulfate with the qualities desired may be effected in ilillereut Ways. My preferred method is toucld a freshly or newly precipitated and Well washedferric hydroxid. magma to the ferric sulfate solution and continue the addition long as the ferric hydrorgid is taken up in solution cite stirring in the liquon In this Way no impurities of any kind aroiutrocluced and S-weclficatlou of Lcttors Patent.

1913. Serial No. 761,508.

uct by the addition of barium or calcium hyclroxid to the acid ferric sulfate liquor, This alkaline earth hydroxid first neutralizes the free sulfuric acid. and then decomposes some of the neutral ferric sulfate resulting in liberating feiric hydroxid which on stirring goes into solution' to "form the basic ferric sulfate. The barium sulfate which is formed being insoluble will sepia.- rate on standing and the clear. solution of uncoutuuiiuatecl basic ferric sulfate, which is the product sought for, can besspumtcd therefrom by dccaututiou or filtration. it should bu noted that carbonate of barium may be used in this latter process with the ums result namely, the libemtiou 01? Y. l1 YCllOXl.ll'Wl)lC.ll is to dissolve in tho sulfate and produce the soluble salt. cl2iui:--

a basic ferric sulfate from ferric sullfue in aqueous solution which cous'sts in aiming barium hydroxld to such solution mil these-by forniin isrium sulfate and liberating ferric l1 di'ouid mid allowing the latter to dissolve in an excess of said ferric sulfate sclu'tiou to produce basic lerz ic sulfate in solution and. thereafter filtering" oil the said basic ionic sulfate solution from the insoluble barium sulfate.

2. The process of pmduciug basic ferric sulfate ircm tle ferric sulfate liquor ob tuined by Washing the crude ferric oxid produced by the heating of coppems which consists in first neutralizing free acid if any be present in such liquor and then adding lmrium hydro/Sid thereby forming barium sulfate and liberating ferric hydroxid and 

